from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The study of organisms or environmental conditions that have been rendered free of bacteria or contaminants or into which a known microorganism or contaminant has been introduced for research purposes.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The science involved with maintaining a microbiologically controlled environment.
Greek gnōtos, known; + biotics, study of living organisms.(American Heritage® Dictionary of the English Language, Fourth Edition)